Method of performing BWP operation in wireless communication system and an apparatus therefor

ABSTRACT

This specification provides a method of performing a bandwidth part (BWP) operation in a wireless communication system. Specifically, The method performed by a terminal includes receiving a first message including information related to at least one initial BWP configuration from a network, receiving a second message including configuration information for an additional BWP from the network, receiving downlink control information (DCI) related to BWP switching for at least one configured BWP from the network, and transmitting and receiving signals to and from the network in an activated BWP based on the received DCI.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/316,891, filed on Jan. 10, 2019, which is a National Stage filingunder 35 U.S.C. 371 of International Application No. PCT/KR2018/008356,filed on Jul. 24, 2018, which claims the benefit of U.S. ProvisionalApplication No. 62/538,068 filed on Jul. 28, 2017 and KR Application No.10-2018-0085987 filed on Jul. 24, 2018, the contents of which are allhereby incorporated by reference herein in their entirety.

TECHNICAL FIELD

The present invention relates to a wireless communication system and,more particularly, to a method of performing a bandwidth part (BWP)operation and an apparatus supporting the same.

BACKGROUND ART

Mobile communication systems have been generally developed to providevoice services while guaranteeing user mobility. Such mobilecommunication systems have gradually expanded their coverage from voiceservices through data services up to high-speed data services. However,as current mobile communication systems suffer resource shortages andusers demand even higher-speed services, development of more advancedmobile communication systems is needed.

The requirements of the next-generation mobile communication system mayinclude supporting huge data traffic, a remarkable increase in thetransfer rate of each user, the accommodation of a significantlyincreased number of connection devices, very low end-to-end latency, andhigh energy efficiency. To this end, various techniques, such as smallcell enhancement, dual connectivity, massive multiple input multipleoutput (MIMO), in-band full duplex, non-orthogonal multiple access(NOMA), supporting super-wide band, and device networking, have beenresearched.

DISCLOSURE Technical Problem

An object of this specification is to provide a method of configuring aBWP and an operation method of a UE and an eNB in a configured BW.

Furthermore, an object of this specification is to provide a method ofconfiguring a shared control resource set (CORESET) depending on whethera shared part is present between BWPs and transmitting and receiving DCIrelated to BWP switching through the shared CORESET.

Furthermore, an object of this specification is to provide a processingmethod if the reception of DCI related to BWP switching and a messagerelated to the reception of the corresponding DCI have missed.

Technical objects to be achieved in the present invention are notlimited to the aforementioned technical objects, and other technicalobjects not described above may be evidently understood by a personhaving ordinary skill in the art to which the present invention pertainsfrom the following description.

Technical Solution

This specification is to provide a method of performing a bandwidth part(BWP) operation in a wireless communication system.

Specifically, the method performed by a terminal includes receiving afirst message including information related to at least one initial BWPconfiguration from a network, receiving a second message includingconfiguration information for an additional BWP from the network,receiving downlink control information (DCI) related to BWP switchingfor at least one configured BWP from the network, and transmitting andreceiving signals to and from the network in an activated BWP based onthe received DCI.

Furthermore, in this specification, the BWP switching includes theactivation of a BWP or the deactivation of a BWP.

Furthermore, in this specification, the configuration information forthe additional BWP includes a BWP identifier (ID) to identify theadditional BWP.

Furthermore, in this specification, when a downlink (DL) BWP is switchedby the DCI, a uplink (UL) BWP switches into a corresponding BWP.

Furthermore, in this specification, the corresponding BWP is a uplink(UL) BWP corresponding to the switched BWP.

Furthermore, in this specification, the switching into the correspondingBWP for the UL BWP is applied in a time division duplex (TDD) system.

Furthermore, in this specification, the DCI related to the BWP switchingis received in a shared control resource set (CORESET), and the sharedCORESET is configured in a shared part between a configured first BWPand a configured second BWP.

Furthermore, in this specification, the first BWP and the second BWPhave the same numerology.

Furthermore, in this specification, the method further includestransmitting an acknowledge (ACK) or a non-acknowledge (NACK) for theDCI to the network.

Furthermore, in this specification, a terminal performing a bandwidthpart (BWP) operation in a wireless communication system includes a radiofrequency (RF) module for transmitting and receiving radio signals and aprocessor functionally connected to the RF module. The processor isconfigured to receive a first message including information related toat least one initial BWP configuration from a network, receive a secondmessage including configuration information about an additional BWP fromthe network, receive downlink control information (DCI) related to BWPswitching for at least one configured BWP from the network, and transmitand receiving signals to and from the network in the activated BWP basedon the received DCI.

Advantageous Effects

This specification defines a method of configuring a BWP so that signalscan be transmitted and received in an activated BWP between a UE and anetwork.

Furthermore, this specification has an effect in that performancedeterioration attributable to a system error can be minimized because aprocessing operation of messages related to BWP switching is clearlydefined depending on whether a shared part is present between BWPs.

Effects which may be obtained in the present invention are not limitedto the aforementioned effects, and other technical effects not describedabove may be evidently understood by a person having ordinary skill inthe art to which the present invention pertains from the followingdescription.

DESCRIPTION OF DRAWINGS

The accompanying drawings included as part of the detailed descriptionin order to help understanding of the present invention provideembodiments of the present invention, and describe the technicalcharacteristics of the present invention along with the detaileddescription.

FIG. 1 is a diagram showing an example of general system architecture ofNR to which a method proposed in this specification may be applied.

FIG. 2 shows the relation between an uplink frame and a downlink framein a wireless communication system to which a method proposed in thisspecification may be applied.

FIG. 3 shows an example of a resource grid supported in a wirelesscommunication system to which a method proposed in this specificationmay be applied.

FIG. 4 shows an example of a self-contained subframe structure to whicha method proposed in this specification may be applied.

FIG. 5 shows examples of self-contained subframe structures to which amethod proposed in this specification may be applied.

FIG. 6 is a diagram showing an example of a BWP state to which a methodproposed in this specification may be applied.

FIG. 7 is a flowchart showing an example of an operating method of a UErelated to a BWP operation proposed in this specification.

FIG. 8 illustrates a block diagram of a wireless communication device towhich a method proposed in this specification may be applied.

FIG. 9 illustrates a block diagram of a communication device accordingto an embodiment of the present invention.

FIG. 10 is a diagram showing an example of the RF module of a wirelesscommunication device to which a method proposed in this specificationmay be applied.

FIG. 11 is a diagram showing another example of the RF module of awireless communication device to which a method proposed in thisspecification may be applied.

MODE FOR INVENTION

Some embodiments of the present disclosure are described in detail withreference to the accompanying drawings. A detailed description to bedisclosed along with the accompanying drawings is intended to describesome exemplary embodiments of the present disclosure and is not intendedto describe a sole embodiment of the present disclosure. The followingdetailed description includes more details in order to provide fullunderstanding of the present disclosure. However, those skilled in theart will understand that the present disclosure may be implementedwithout such more details.

In some cases, in order to avoid making the concept of the presentdisclosure vague, known structures and devices are omitted or may beshown in a block diagram form based on the core functions of eachstructure and device.

In the present disclosure, a base station has the meaning of a terminalnode of a network over which the base station directly communicates witha terminal. In this document, a specific operation that is described tobe performed by a base station may be performed by an upper node of thebase station according to circumstances. That is, it is evident that ina network including a plurality of network nodes including a basestation, various operations performed for communication with a terminalmay be performed by the base station or other network nodes other thanthe base station. The base station (BS) may be substituted with anotherterm, such as a fixed station, a Node B, an eNB (evolved-NodeB), a basetransceiver system (BTS), or an access point (AP). Furthermore, theterminal may be fixed or may have mobility and may be substituted withanother term, such as user equipment (UE), a mobile station (MS), a userterminal (UT), a mobile subscriber station (MSS), a subscriber station(SS), an advanced mobile station (AMS), a wireless terminal (WT), amachine-type communication (MTC) device, a machine-to-Machine (M2M)device, or a device-to-device (D2D) device.

Hereinafter, downlink (DL) means communication from a base station toUE, and uplink (UL) means communication from UE to a base station. InDL, a transmitter may be part of a base station, and a receiver may bepart of UE. In UL, a transmitter may be part of UE, and a receiver maybe part of a base station.

Specific terms used in the following description have been provided tohelp understanding of the present disclosure, and the use of suchspecific terms may be changed in various forms without departing fromthe technical sprit of the present disclosure.

The following technologies may be used in a variety of wirelesscommunication systems, such as code division multiple access (CDMA),frequency division multiple access (FDMA), time division multiple access(TDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and non-orthogonalmultiple access (NOMA). CDMA may be implemented using a radiotechnology, such as universal terrestrial radio access (UTRA) orCDMA2000. TDMA may be implemented using a radio technology, such asglobal system for mobile communications (GSM)/general packet radioservice (GPRS)/enhanced data rates for GSM evolution (EDGE). OFDMA maybe implemented using a radio technology, such as Institute of electricaland electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX),IEEE 802.20, or evolved UTRA (E-UTRA). UTRA is part of a universalmobile telecommunications system (UMTS). 3rd generation partnershipproject (3GPP) Long term evolution (LTE) is part of an evolved UMTS(E-UMTS) using evolved UMTS terrestrial radio access (E-UTRA), and itadopts OFDMA in downlink and adopts SC-FDMA in uplink. LTE-advanced(LTE-A) is the evolution of 3GPP LTE.

Embodiments of the present disclosure may be supported by the standarddocuments disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, thatis, radio access systems. That is, steps or portions that belong to theembodiments of the present disclosure and that are not described inorder to clearly expose the technical spirit of the present disclosuremay be supported by the documents. Furthermore, all terms disclosed inthis document may be described by the standard documents.

In order to more clarify a description, 3GPP LTE/LTE-A is chieflydescribed, but the technical characteristics of the present disclosureare not limited thereto.

Definition of Terms

eLTE eNB: An eLTE eNB is an evolution of an eNB that supports aconnection for an EPC and an NGC.

gNB: A node for supporting NR in addition to a connection with an NGC

New RAN: A radio access network that supports NR or E-UTRA or interactswith an NGC

Network slice: A network slice is a network defined by an operator so asto provide a solution optimized for a specific market scenario thatrequires a specific requirement together with an inter-terminal range.

Network function: A network function is a logical node in a networkinfra that has a well-defined external interface and a well-definedfunctional operation.

NG-C: A control plane interface used for NG2 reference point between newRAN and an NGC

NG-U: A user plane interface used for NG3 reference point between newRAN and an NGC

Non-standalone NR: A deployment configuration in which a gNB requires anLTE eNB as an anchor for a control plane connection to an EPC orrequires an eLTE eNB as an anchor for a control plane connection to anNGC

Non-standalone E-UTRA: A deployment configuration an eLTE eNB requires agNB as an anchor for a control plane connection to an NGC.

User plane gateway: A terminal point of NG-U interface

General System

FIG. 1 is a diagram illustrating an example of an overall structure of anew radio (NR) system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 1 , an NG-RAN is composed of gNBs that provide anNG-RA user plane (new AS sublayer/PDCP/RLC/MAC/PHY) and a control plane(RRC) protocol terminal for a UE (User Equipment).

The gNBs are connected to each other via an Xn interface.

The gNBs are also connected to an NGC via an NG interface.

More specifically, the gNBs are connected to a Access and MobilityManagement Function (AMF) via an N2 interface and a User Plane Function(UPF) via an N3 interface.

NR (New Rat) Numerology and Frame Structure

In the NR system, multiple numerologies may be supported. Thenumerologies may be defined by subcarrier spacing and a CP (CyclicPrefix) overhead. Spacing between the plurality of subcarriers may bederived by scaling basic subcarrier spacing into an integer N (or μ). Inaddition, although a very low subcarrier spacing is assumed not to beused at a very high subcarrier frequency, a numerology to be used may beselected independent of a frequency band.

In addition, in the NR system, a variety of frame structures accordingto the multiple numerologies may be supported.

Hereinafter, an Orthogonal Frequency Division Multiplexing (OFDM)numerology and a frame structure, which may be considered in the NRsystem, will be described.

A plurality of OFDM numerologies supported in the NR system may bedefined as in Table 1.

TABLE 1 μ Δf = 2^(μ) · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal, Extended 3 120 Normal 4 240 Normal 5 480 Normal

Regarding a frame structure in the NR system, a size of various fieldsin the time domain is expressed as a multiple of a time unit ofT_(s)=1/(Δf_(max)·N_(f)). In this case, Δf_(max)=480·10³ and N_(f)=4096.DL and UL transmission is configured as a radio frame having a sectionof T_(f)=(Δf_(max)N_(f)/100)·T_(s)=10 ms. The radio frame is composed often subframes each having a section ofT_(sf)=(Δf_(max)N_(f)/1000)·T_(s)=1 ms. In this case, there may be a setof UL frames and a set of DL frames.

FIG. 2 illustrates a relationship between a UL frame and a DL frame in awireless communication system to which a method proposed by the presentdisclosure may be implemented.

As illustrated in FIG. 2 , a UL frame number I from a User Equipment(UE) needs to be transmitted T_(TA)=N_(TA)T_(s) before the start of acorresponding DL frame in the UE.

Regarding the numerology μ, slots are numbered in ascending order ofn_(s) ^(μ)∈{0, . . . , N_(subframe) ^(slots,μ)−1} in a subframe, and inascending order of n_(s,f) ^(μ)∈{0, . . . , N_(frame) ^(slots,μ)−1} in aradio frame. One slot is composed of continuous OFDM symbols of N_(symb)^(μ), and N_(symb) ^(μ) is determined depending on a numerology in useand slot configuration. The start of slots n_(s) ^(μ) in a subframe istemporally aligned with the start of OFDM symbols n_(s) ^(μ)N_(symb)^(μ) in the same subframe.

Not all UEs are able to transmit and receive at the same time, and thismeans that not all OFDM symbols in a DL slot or an UL slot are availableto be used.

Table 2 shows the number of OFDM symbols per slot for a normal CP in thenumerology μ, and Table 3 shows the number of OFDM symbols per slot foran extended CP in the numerology μ.

TABLE 2 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots, μ)N_(subframe) ^(slots, μ) N_(symb) ^(μ) N_(frame) ^(slots, μ)N_(subframe) ^(slots, μ) 0 14 10 1 7 20 2 1 14 20 2 7 40 4 2 14 40 4 780 8 3 14 80 8 — — — 4 14 160 16 — — — 5 14 320 32 — — —

TABLE 3 Slot configuration 0 1 μ N_(symb) ^(μ) N_(frame) ^(slots, μ)N_(subframe) ^(slots, μ) N_(symb) ^(μ) N_(frame) ^(slots, μ)N_(subframe) ^(slots, μ) 0 12 10 1 6 20 2 1 12 20 2 6 40 4 2 12 40 4 680 8 3 12 80 8 — — — 4 12 160 16 — — — 5 12 320 32 — — —

NR Physical Resource

Regarding physical resources in the NR system, an antenna port, aresource grid, a resource element, a resource block, a carrier part,etc. may be considered.

Hereinafter, the above physical resources possible to be considered inthe NR system will be described in more detail.

First, regarding an antenna port, the antenna port is defined such thata channel over which a symbol on one antenna port is transmitted can beinferred from another channel over which a symbol on the same antennaport is transmitted. When large-scale properties of a channel receivedover which a symbol on one antenna port can be inferred from anotherchannel over which a symbol on another antenna port is transmitted, thetwo antenna ports may be in a QC/QCL (quasi co-located or quasico-location) relationship. Herein, the large-scale properties mayinclude at least one of delay spread, Doppler spread, Doppler shift,average gain, and average delay.

FIG. 3 illustrates an example of a resource grid supported in a wirelesscommunication system to which a method proposed by the presentdisclosure may be implemented.

Referring to FIG. 3 , a resource grid is composed of N_(RB) ^(μ)N_(sc)^(RB) subcarriers in a frequency domain, each subframe composed of 14·2μOFDM symbols, but the present disclosure is not limited thereto.

In the NR system, a transmitted signal is described by one or moreresource grids, composed of N_(RB) ^(μ)N_(sc) ^(RB) subcarriers, and2^(μ)N_(symb) ^((μ)) OFDM symbols Herein, N_(RB) ^(μ)≤N_(RB) ^(max, μ).The above N_(RB) ^(max,μ) indicates the maximum transmission bandwidth,and it may change not just between numerologies, but between UL and DL.

In this case, as illustrated in FIG. 3 , one resource grid may beconfigured for the numerology μ and an antenna port p.

Each element of the resource grid for the numerology μ and the antennaport p is indicated as a resource element, and may be uniquelyidentified by an index pair (k,l). Herein, k=0, . . . , N_(RB)^(μ)N_(sc) ^(RB)−1 is an index in the frequency domain, and l=0, . . . ,2^(μ) N_(symb) ^((μ))−1 indicates a location of a symbol in a subframe.To indicate a resource element in a slot, the index pair (k,l) is used.Herein, l=0, . . . , N_(symb) ^(μ)−1.

The resource element (k,l) for the numerology μ and the antenna port pcorresponds to a complex value a_(k,l) ^((p,μ)). When there is no riskof confusion or when a specific antenna port or numerology is specified,the indexes p and μ may be dropped and thereby the complex value maybecome a_(k,l) ^((p)) or a_(k,l) .

In addition, a physical resource block is defined as N_(sc) ^(RB)=12continuous subcarriers in the frequency domain. In the frequency domain,physical resource blocks may be numbered from 0 to N_(RB) ^(μ)−1. Atthis point, a relationship between the physical resource block numbern_(PRB) and the resource elements (k,l) may be given as in Equation 1.

$\begin{matrix}{n_{PRB} = \left\lfloor \frac{k}{N_{sc}^{RB}} \right\rfloor} & \left\lbrack {{Equation}1} \right\rbrack\end{matrix}$

In addition, regarding a carrier part, a UE may be configured to receiveor transmit the carrier part using only a subset of a resource grid. Atthis point, a set of resource blocks which the UE is configured toreceive or transmit are numbered from 0 to N_(URB) ^(μ)−1 in thefrequency region.

Self-Contained Subframe Structure

A time division duplexing (TDD) structure taken into consideration inthe NR system is a structure in which both uplink (UL) and downlink (DL)are processed in a single subframe. This is for minimizing latency ofdata transmission in the TDD system, and such a structure is called aself-contained subframe structure.

FIG. 4 shows an example of a self-contained subframe structure to whicha method proposed in this specification may be applied. FIG. 4 is onlyfor convenience of description, and does not limit the scope of thepresent invention.

Referring to FIG. 4 , in the case of legacy LTE, a case where onesubframe includes 14 orthogonal frequency division multiplexing (OFDM)symbols is assumed.

In FIG. 4 , a region 402 means a downlink control region, and a region404 means an uplink control region. Furthermore, a region (i.e., aregion not having a separate indication) other than the region 402 andthe region 404 may be used for the transmission of downlink data or thetransmission of uplink data.

That is, uplink control information and downlink control information aretransmitted in one self-contained subframe. In contrast, in the case ofdata, uplink data or downlink data is transmitted in one self-containedsubframe.

If the structure shown in FIG. 4 is used, downlink transmission anduplink transmission are sequentially performed in one self-containedsubframe. The transmission of downlink data and the reception of uplinkACK/NACK may be performed.

As a result, when an error of data transmission occurs, the time takenup to the retransmission of data may be reduced. Accordingly, latencyrelated to data delivery can be minimized.

In a self-contained subframe structure such as FIG. 4 , a time gap for aprocess for a base station (eNodeB, eNB, gNB) and/or a terminal (userequipment (UE)) to switch from a transmission mode to a reception modeor a process for the base station and/or the terminal to switch from thereception mode to the transmission mode is necessary. In relation to thetime gap, if uplink transmission is performed in a self-containedsubframe after downlink transmission, some OFDM symbol(s) may beconfigured as a guard period (GP).

Furthermore, in the NR system, several types of self contained subframestructures may be taken into consideration in addition to the structureshown in FIG. 4 .

FIG. 5 shows examples of self-contained subframe structures to which amethod proposed in this specification may be applied. FIG. 5 is only forconvenience of description, and does not limit the scope of the presentinvention.

As in FIGS. 5(a) to 5(d), a self-contained subframe in the NR system mayhave various combinations using a downlink (DL) control region, a DLdata region, a guard period (GP), an uplink (UL) control region, and/oran uplink (UL) data region as one unit.

A new radio (NR) system includes terminals (e.g., UEs) supportingvarious bandwidths (BWs).

One of the representative objects of the NR system is that a network(NW) flexibly schedules all UEs.

That is, the network needs to support the flexible signaling of the BWsizes (BWs that may be supported by UEs) and BW locations of UEs inorder to optimize the transmission and reception environment of all theUEs.

To this end, the UE may receive one or more bandwidth parts (BWPs)configured by a network.

In this case, the BWPs may have various (or different) sizes or the samesize.

Elements forming each BWP may include a bandwidth size, a frequencylocation, numerology and a BWP identifier (ID).

The UE may communicate with the network using one or a plurality ofBWP(s) of the configured BWPs.

In this case, a BWP used for the communication may be called anactivated BWP.

That is, one UE may have one or a plurality of activated BWPs.

Hereinafter, in this specification, a method of configuring a BWP in oneUE, a method of activating/deactivating a BWP for communication with anetwork, and operations of a UE and network in the methods are describedin detail.

In this specification, the activation or deactivation of a BWP may be aconcept included in BWP switching.

First, a BWP and CORESET used in this specification are described inbrief.

A bandwidth part (BWP) means a subset of contiguous common resourceblocks.

A maximum of 4 BWPs may be configured in a UE in DL having one DL BWPthat is activated in a given time. Furthermore, the UE does not expectthe reception of a PDSCH, PDCCH or CSI-RS (other than a CSI-RS for RRM)out of an activated BWP.

Furthermore, a maximum of 4 BWPs may be configured in a UE in DL havingone UL BWP that is activated in a given time.

Furthermore, in TDD (unpaired spectrum), a UE may assume that 2 BWPshave been paired into the same BWP index.

A control resource set (CORESET) includes N resource blocks given by ahigher layer parameter in the frequency domain. In this case, Nindicates the number of RBs within the CORESET.

Initial Bandwidth Part Configuration Method

First, an initial BWP configuration method is described.

After initial access to a network, a UE may have BWPs available for datatransmission and reception configured by the network.

Some methods of performing the initial BWP configuration are described.

(Method 1)

Method 1 is a method of configuring a BW in which a message 4 (Msg4) isreceived in an RACH procedure as an initial BWP.

A BWP configured through Method 1 continues to remain until a BWPconfiguration is received by a UE through RRC signaling.

(Method 2)

Method 2 is a method of configuring the remaining minimum systeminformation (RMSI) BW as the initial BWP of a UE.

A UE may detect a synchronization signal (SS) block (SSB) and may havean RMSI BW indicated by a physical broadcast channel (PBCH).

The UE may configure the RMSI BW as an initial BWP.

In this case, both an NW and the UE do not require an additional processfor configuring the initial BWP.

A BWP may be additionally configured in the UE within the RMSI BW andresources may be allocated to the UE.

(Method 3)

Method 3 is a method of always configuring an initial BWP using an RRCconfiguration.

An initial BWP is configured in a UE through RRC signaling.

The initial BWP may include at least one initial DL BWP and at least oneinitial UL BWP.

If corresponding information (information about an initial BWP) is notpresent in the RRC signaling, the UE may assume the same BWP or RMSI BWas a system BW as an initial BWP.

One or a plurality of BWP configurations may be present in the RRCsignaling.

The BWP configuration may include a BWP ID to identify a BWP.

If one configured BWP is present, a UE may consider the correspondingBWP to be an activated state.

Alternatively, if a plurality of configured BWPs is present, an NW mayindicate which BWP(s) will be activated for a UE.

If one activated BWP is permitted at one instant, it may be assumed thata BWP having a specific BWP ID (e.g., BWP ID=1) from among a pluralityof configured BWPs has been activated (or activated).

Additional Bandwidth Part (BWP) Configuration Method

Next, a method of configuring an additional BWP is described.

An additional BWP in addition to BWPs configured in an initial accessprocess along with an NW may be configured in a UE.

Some methods of configuring an additional BWP are described.

(Method 1)

Method 1 is a method of providing notification of the BW of anadditional BWP and related parameters through RRC signaling.

If an additional BWP is RRC configured, the following some contents maybe taken into consideration.

Consideration 1: BWP indication capable of activating an old BWP ofadditional configurations while overriding it is performed.

In the state in which an old BWP has been activated, if the samelocation as that of the old BWP or the old BWP is included regardless ofthe numerology of an additional BWP, it may be configured (or defined)that a newly configured BWP has been activated.

Consideration 2: it may be considered that only an additional BWP isalways added in a re-configuration through RRC signaling (in other thaninitial RRC configuration).

(Method 2)

In Method 2, an additional BWP is configured and a BWP isactivated/deactivated based on UE-specific downlink control information(DCI).

As in the aforementioned RRC signaling method, a new BWP configurationis performed based on UE-specific DCI and a corresponding BWP may beactivated simultaneously.

For example, if a configured new BWP ID is configured identically with acurrently activated BWP ID, a new BWP may be activated at the same timewhen an old BWP is deactivated.

Activate/Deactivate Procedures for a Bandwidth Part

Next, an activation/deactivation procedure for a BWP is described.

Hereinafter, DCI-based BWP activation/deactivation is described as anexample.

That is, the switching of a DCI-based BWP is described.

An activated BWP and a BWP activated at a next instant, from amongconfigured BWPs, may have different procedures depending on an overlapsituation between the BWPs when activation (or deactivation) isperformed.

That is, three cases may be basically described as in FIGS. 6(a) to6(c).

FIG. 6 is a diagram showing an example of a BWP state to which a methodproposed in this specification may be applied.

Specifically, FIG. 6 a shows a case where BWPs fully overlap (in afrequency domain), FIG. 6 b shows a case where BWPs partially overlap,and FIG. 6 c shows a case where BWPs do not overlap.

Option 1 (FIG. 6 a ) shows a case where a currently activated BWP1 isfully included in a BWP2 to be activated next.

Option 2 (FIG. 6 b ) shows a case where part of a BWP1 overlaps a BWP2.

Option 3 (FIG. 6 c ) shows a case where a BWP1 is fully separated from aBWP2.

A control resource set (CORESET) configured in each of the BWPs shown inFIG. 6 is an example and may be configured in various ways depending onan NW configuration.

If a BWP1 is fully included in a BWP2 in the frequency domain and thetwo BWPs have the same numerology, a shared CORESET may be configured inthe BWPs.

The shared CORESET is a part 610 indicative of the same range in thefrequency domain, and may have the same or different indexing indifferent BWPs.

As in Option 1 of FIG. 6 a , a CORESET having the same size as the BWP1is configured in the BWP2. A network transmits an activation message toa UE using the UE-specific search space (USS) of the correspondingCORESET.

If both the BWP1 and the BWP2 use local PRB indexing and the lowestfrequency is a start point in both the BWPs, a UE may perform a CORESETdecoding process in the two BWPs in the same manner.

Furthermore, there may be a slight difference at subsequent timing ofdata decoding.

For example, if a BWP activation message transmitted by an NW has beenmissed, but the NW has received an ACK/NACK (A/N) signal for thecorresponding message from a UE due to a system error, the NW transmitsa BWP2, that is, a new BWP, from next timing.

However, the UE may continue to perform data processing in a BWP1because the BWP activation message has been missed, but there isinfluence on the processing of information of a shared CORESET.

The UE may recognize that a BWP has switched by decoding schedulinginformation of the shared CORESET and may subsequently perform dataprocessing in the BWP2.

However, in this case, some tuning time may be taken because the UE hasto switch to a BW in which the data of the BWP2 can be processed.

In the case of Option 1 (FIG. 6 a ) and Option 2 (FIG. 6 b ), a UE maydetermine the shared part of a plurality of BWPs if the plurality ofBWPs is configured in the UE.

A CORESET shared as the shared part may be configured.

A NW may configure a shared CORESET and a not-shared CORESET in the UE.When BWP adaptation DCI can be reached may be configured in the UE foreach CORESET.

The BWP adaptation DCI may be expressed as BWP switching DCI and maymean DCI for indicating the switching of a BWP.

That is, the UE may identify whether BWP adaptation DCI can be reachedbased on a DCI size for each CORESET or may identify whether BWPadaptation DCI can be reached depending on the configuration of theconfigurations of a BWP that is covered for each CORESET.

A UE may not expect BWP adaptation in addition to a CORESET in which BWPadaptation DCI can be reduced. The UE assumes self-BWP scheduling in acorresponding BWP or CORSET.

In this case, self-BWP scheduling means the scheduling of a current BWP.Self-BWP scheduling DCI may mean DCI for scheduling a current BWP.

If one or more CORESETs are configured in a UE, BWP adaptation DCI isreceived in one of the CORESETs, and self-BWP scheduling is performed inanother CORESET at a timing at which the corresponding BWP adaptationDCI is received, the following may be assumed.

That is, it is assumed that a physical downlink shared channel (PDSCH)or physical uplink shared channel (PUSCH) based on self-BWP schedulingoccurs earlier than a PDSCH or PUSCH indicated in BWP adaptation DCI anda network provides notification of a gap for retuning/switching delaythrough DCI or the gap is semi-statically configured.

Furthermore, it is assumed that self-BWP scheduling and BWP adaptationdo not occur simultaneously in one slot.

If a PDSCH or PUSCH for a self-BWP and a PDSCH or PUSCH for BWPadaptation overlap (or redundant), it is assumed that the BWP adaptationhas priority.

Furthermore, a PDSCH or PUSCH for a self-BWP may be dropped, ifnecessary.

Alternatively, it may be assumed that a self-BWP or BWP adaptation occursimultaneously in all the CORESETs.

In this case, if each PUCCH resource is configured for each BWP withrespect to PUCCH transmission, a network may guarantee that a PUCCHresource is indicated as a resource associated with a new BWP or datamapped to the same PUCCH resource is scheduled within the same BWP evenin the case of self-BWP scheduling.

If not, a PUCCH corresponding to a new BWP or a PUCCH corresponding to aprevious BWP may have priority based on its priority.

If the capability of a UE is supported, two PUCCHs may be transmitted atthe same time.

Furthermore, if an old activated BWP and new activated BWP for one UE donot overlap in the frequency domain or do not use a shared CORESET, DCIof a common CORESET may be used.

In such a case, when the aforementioned situation occurs, there may be acase where a system does not perform a normal operation due to adifference in understanding between an NW and a UE.

That is, the NW may transmit a new BWP activation message, may receivean A/N message for the corresponding message from the UE due to a systemerror, and may transmit the A/N message in a new BWP.

In this case, the UE continues to perform decoding in an old BWP becausethe new BWP activate message is missed.

In such a case, in order to guarantee higher transmission/receptionreliability, a processing process for phenomenon occurring when variousphenomena occur may be defined as follows.

In this case, a BWP1 is a BWP now activated from the viewpoint of a UE,and a BWP2 is a BWP to be activated after a DCI command is received froman NW.

(Case 1)

Case 1 is a case where both an NW and a UE operate in the BWP1 and theUE has missed DCI (NW: BWP1—UE: BWP1, DCI missing).

That is, if the UE has not received the DCI although the NW hastransmitted the DCI for activating a new BWP to the UE, both the NW andthe UE perform processing in the BWP1.

In this case, if the NW does not receive a response from the UE for aspecific time, it may retransmit the same message (new BWP activationDCI).

That is, Case 1 does not have any ambiguity.

(Case 2)

Case 2 is a case where the NW operates in the BWP1, the UE operates inthe BWP2, and the NW has missed an ACK/NACK signal (NW: BWP1—UE: BWP2,A/N missing).

The NW transmits new BWP activation DCI to the UE. The UE detects theDCI and transmits decoding results to the NW.

Furthermore, the UE may activate the BWP2 from next timing.

However, if the NW has missed A/N transmitted by the UE, the NWcontinues to transmit a message in the BWP1.

In such a case, the NW may consider that BWP adaptation is successfulonly when A/N is received from the UE, and may transmit a correspondingconfirm message to the UE.

Furthermore, the UE receives a new BWP only when it receives the confirmmessage.

Alternatively, the NW may determine whether the UE has received a newBWP activation message based on the A/N of the UE for data transmittedin an old BWP.

For example, if the NW has transmitted a new BWP activation message andcommon data in the subframe of an old BWP and has not received A/N forthe new BWP activation message after a given time, but has received anACK signal for the common data, the NW may determine that the A/N signalfor the new BWP activate message transmitted by the UE has been missed.

Furthermore, the NW may consider the probability that the UE may havereceived the new BWP activation message to be high, and may performduplicate TX in the old/new BWP at next timing in order to improvereliability of control information.

(Case 3)

Case 3 is a case where the NW operates in the BWP2, the UE operates inthe BWP1, and the UE has missed a confirm message for an A/N signaltransmitted with respect to new BWP activation DCI (NW: BWP2—UE: BWP1,DTX-to-A/N).

The NW transmits the new BWP activation DCI, and the UE detects the DCIand transmits decoding results to the NW.

If a confirm message is missed in a process for the NW to receive thecorresponding A/N and to transmit the confirm message for the A/N signalto the UE or if the confirm message is not transmitted through NWscheduling, the UE may continue to be in the BWP1 in order to receivethe confirm message.

Furthermore, the NW receives an (A/N) response from the UE and transmitsdata to the UE in the BWP2 at a next instant.

In this case, the UE may perform reception processing in two BWPs untilit receives the confirm message depending on the capability of the UE.The NW may transmit data to the UE in a new BWP and transmit the confirmmessage to the UE through an old BWP at next timing.

(Case 4)

Case 4 is a case where the NW and the UE operate in the BWP2 and the NWhas received A/N from the UE (NW: BWP2—UE: BWP2, A/N).

The NW transmits new BWP activate DCI to the UE. The UE detects the DCIand transmits decoding results to the NW.

Furthermore, the UE activates the BWP2 from next timing.

In this case, if the NW has accurately received A/N for the new BWPactivation DCI, both the NW and the UE perform transmission andreception in the BWP2 at next timing.

As another embodiment, when a DL BWP is switched in time division duplex(TDD), an UL BWP may switch into a corresponding BWP.

The corresponding BWP may mean an UP BWP corresponding to the switchedBWP.

That is, a DL BWP and an UL BWP are identically switched based on a BWPindex (or BWP ID) indicated in DCI format 0_1 or DCI format 1_1.

In this case, DCI format 0_1 is DCI related to uplink scheduling, andDCI format 1_1 is DCI related to downlink scheduling.

In a TDD HARQ procedure, a given window size is determined and a BWP maybe configured to not switch in the predetermined window.

The TDD may be expressed as an unpaired spectrum, and frequency divisionduplex (FDD) may be expressed as a paired spectrum.

In addition to the aforementioned method, as yet another embodiment,from the viewpoint of Option 2 (FIG. 6 b ), a BWP activation message maybe retransmitted using both a shared CORESET and a not-shared CORESET.

For example, an NW may transmit new BWP activation DCI and transmit asignaling signal in both a shared CORESET and a not-shared CORESET froma next instant regardless of whether A/N for the DCI has been received.

If a UE receives the first BWP activation DCI, it may monitor the twoCORESETs in a new BWP. If not, the UE may receive a BWP activationmessage by monitoring a shared CORESET configured in an old BWP.

RRM Handling According to BWP Switching

Next, a radio resource management (RRM) handling method according to BWPswitching is described.

In the environment in which a BWP dynamically switches, if BWPs have anested structure, an RRM BW may be configured as the smallest BWP.

When CSI measurement is performed in an environment having the samestructure, the following some cases may be present depending on a BWPconfiguration.

First, accumulation is not performed on BWPs having differentnumerologies.

Second, accumulation is performed on a portion having the same physicalresource blocks (PRBs) from among BWPs having the same numerology.

In an environment in which a BWP dynamically switches, an RRM BW may beconfigured for each BWP regardless of whether BWPs are configured in anested structure.

FIG. 7 is a flowchart showing an example of an operating method of a UErelated to a BWP operation proposed in this specification.

First, the UE receives a first message, including information related toat least one initial BWP configuration, from a network (S710).

The information related to the initial BWP configuration may include aBWP ID to identify an initial BWP. In this case, the BWP ID may be setto “0.”

Alternatively, the ID of the initial BWP may be previously defined to“0.” In this case, information related to an initial BWP configurationmay not be included.

The first message may be a broadcast message or a physical broadcastchannel (PBCH).

The PBCH may mean a physical channel in which system information, inparticular, a master information block (MIB) is transmitted.

In this case, the physical channel is resource elements that carryinformation downloaded from a higher layer. The resource elements mayinclude code, a frequency, and a time-slot.

Furthermore, the UE receives a second message, including configurationinformation for an additional BWP, from the network (S720).

In this case, the second message may be expressed as a RRC signaling orhigher layer signaling.

That is, the second message may be RRC signaling downloaded from ahigher layer in the RRC connected state.

The configuration information about the additional BWP may include a BWPidentifier (ID) to identify the additional BWP.

Furthermore, the UE receives downlink control information (DCI) relatedto BWP switching for at least one configured BWP from the network(S730).

In this case, the BWP switching may mean the activation of a BWP or thedeactivation of a BWP.

If a downlink (DL) BWP is switched by the DCI, a(n) uplink (UL) BWP mayswitch into a corresponding BWP.

In this case, the corresponding BWP may mean an UL BWP corresponding tothe switched BWP.

For example, if the ID or index of a BWP switched by the DCI is “2”, aswitched DL BWP may mean a DL BWP having a BWP ID=2, and a switched ULBWP may mean an UL BWP having a BWP ID=2.

Furthermore, the switching into the corresponding BWP for the UL BWP maybe applied to only a TDD system.

Furthermore, the UE transceives (or transmits and receives) signal(s)with (to/from) the network in an activated BWP based on the received DCI(S740).

Additionally, the DCI related to the BWP switching may be received in ashared control resource set (CORESET). The shared CORESET may beconfigured in a shared part between a configured first BWP and aconfigured second BWP.

The first BWP and the second BWP may have the same numerology.

Additionally, the UE may transmit an acknowledge (ACK) or anon-acknowledge (NACK) for the DCI to the network.

General Apparatus to which the Present Invention May be Applied

FIG. 8 illustrates a block diagram of a wireless communication device towhich a method proposed in this specification may be applied.

Referring to FIG. 8 , the wireless communication system includes an eNB810 and multiple UEs 820 disposed within the region of the eNB 810.

Each of the eNB and the UE may be expressed as a wireless device.

The eNB 810 includes a processor 811, a memory 812 and a radio frequency(RF) module 813. The processor 811 implements the functions, processesand/or methods proposed in FIGS. 1 to 7 . The layers of a radiointerface protocol may be implemented by the processor. The memory 812is connected to the processor and stores a variety of types ofinformation for driving the processor. The RF module 813 is connected tothe processor, and transmits and/or receives radio signals.

The UE 820 includes a processor 821, a memory 822 and an RF module 823.

The processor 821 implements the functions, processes and/or methodsproposed in FIGS. 1 to 7 . The layers of a radio interface protocol maybe implemented by the processor. The memory 822 is connected to theprocessor, and stores a variety of types of information for driving theprocessor. The RF module 823 is connected to the processor, andtransmits and/or receives radio signals.

The memory 812, 822 may be positioned inside or outside the processor811, 821 and may be connected to the processor 811, 821 by variouswell-known means.

Furthermore, the eNB 810 and/or the UE 820 may have a single antenna ormultiple antennas.

FIG. 9 illustrates a block diagram of a communication device accordingto an embodiment of the present invention.

In particular, FIG. 9 is a diagram showing the UE of FIG. 8 morespecifically.

Referring to FIG. 9 , the UE may include a processor (or digital signalprocessor (DSP)) 910, an RF module (or RF unit) 935, a power managementmodule 905, an antenna 940, a battery 955, a display 915, a keypad 920,a memory 930, a subscriber identification module (SIM) card 925 (thiselement is optional), a speaker 945, and a microphone 950. The UE mayfurther include a single antenna or multiple antennas.

The processor 910 implements the functions, processes and/or methodsproposed in FIGS. 1 to 7 . The layers of a radio interface protocol maybe implemented by the processor.

The memory 930 is connected to the processor, and stores informationrelated to the operation of the processor. The memory may be positionedinside or outside the processor and may be connected to the processor byvarious well-known means.

A user inputs command information, such as a telephone number, bypressing (or touching) a button of the keypad 920 or through voiceactivation using the microphone 950, for example. The processor receivessuch command information and performs processing so that a properfunction, such as making a phone call to the telephone number, isperformed. Operational data may be extracted from the SIM card 925 orthe memory. Furthermore, the processor may recognize and display commandinformation or driving information on the display 915, for conveniencesake.

The RF module 935 is connected to the processor and transmits and/orreceives RF signals. The processor delivers command information to theRF module so that the RF module transmits a radio signal that formsvoice communication data, for example, in order to initiatecommunication. The RF module includes a receiver and a transmitter inorder to receive and transmit radio signals. The antenna 940 functionsto transmit and receive radio signals. When a radio signal is received,the RF module delivers the radio signal so that it is processed by theprocessor, and may convert the signal into a baseband. The processedsignal may be converted into audible or readable information outputthrough the speaker 945.

FIG. 10 is a diagram showing an example of the RF module of a wirelesscommunication device to which a method proposed in this specificationmay be applied.

Specifically, FIG. 10 shows an example of an RF module that may beimplemented in a frequency division duplex (FDD) system.

First, in a transmission path, the processor described in FIGS. 8 and 9processes data to be transmitted and provides an analog output signal toa transmitter 1010.

In the transmitter 1010, the analog output signal is filtered by a lowpass filter (LPF) 1011 in order to remove images caused bydigital-to-analog conversion (ADC). The signal is up-converted from abaseband to an RF by a mixer 1012 and is amplified by a variable gainamplifier (VGA) 1013. The amplified signal is filtered by a filter 1014,additionally amplified by a power amplifier (PA) 1015, routed by aduplexer(s) 1050/antenna switch(es) 1060, and transmitted through anantenna 1070.

Furthermore, in a reception path, the antenna 1070 receives signals fromthe outside and provides the received signals. The signals are routed bythe antenna switch(es) 1060/duplexers 1050 and provided to a receiver1020.

In the receiver 1020, the received signals are amplified by a low noiseamplifier (LNA) 1023, filtered by a band pass filter 1024, anddown-converted from the RF to the baseband by a mixer 1025.

The down-converted signal is filtered by a low pass filter (LPF) 1026and amplified by a VGA 1027, thereby obtaining the analog input signal.The analog input signal is provided to the processor described in FIGS.8 and 9 .

Furthermore, a local oscillator (LO) 1040 generates transmission andreception LO signals and provides them to the mixer 1012 and the mixer1025, respectively.

Furthermore, a phase locked loop (PLL) 1030 receives control informationfrom the processor in order to generate transmission and reception LOsignals in proper frequencies, and provides control signals to the localoscillator 1040.

Furthermore, the circuits shown in FIG. 10 may be arrayed differentlyfrom the configuration shown in FIG. 10 .

FIG. 11 is a diagram showing another example of the RF module of awireless communication device to which a method proposed in thisspecification may be applied.

Specifically, FIG. 11 shows an example of an RF module that may beimplemented in a time division duplex (TDD) system.

The transmitter 1110 and receiver 1120 of the RF module in the TDDsystem have the same structure as the transmitter and receiver of the RFmodule in the FDD system.

Hereinafter, only a different structure between the RF module of the TDDsystem and the RF module of the FDD system is described. Reference ismade to the description of FIG. 10 for the same structure.

A signal amplified by the power amplifier (PA) 1115 of the transmitteris routed through a band select switch 1150, a band pass filter (BPF)1160 and an antenna switch(es) 1170 and is transmitted through anantenna 1180.

Furthermore, in a reception path, the antenna 1180 receives signals fromthe outside and provides the received signals. The signals are routedthrough the antenna switch(es) 1170, the band pass filter 1160 and theband select switch 1150 and are provided to the receiver 1120.

In the aforementioned embodiments, the elements and characteristics ofthe present invention have been combined in specific forms. Each of theelements or characteristics may be considered to be optional unlessotherwise described explicitly. Each of the elements or characteristicsmay be implemented in a form to be not combined with other elements orcharacteristics. Furthermore, some of the elements and/or thecharacteristics may be combined to form an embodiment of the presentinvention. The sequence of the operations described in the embodimentsof the present invention may be changed. Some of the elements orcharacteristics of an embodiment may be included in another embodimentor may be replaced with corresponding elements or characteristics ofanother embodiment. It is evident that an embodiment may be constructedby combining claims not having an explicit citation relation in theclaims or may be included as a new claim by amendments after filing anapplication.

The embodiment according to the present invention may be implemented byvarious means, for example, hardware, firmware, software or acombination of them. In the case of an implementation by hardware, theembodiment of the present invention may be implemented using one or moreapplication-specific integrated circuits (ASICs), digital signalprocessors (DSPs), digital signal processing devices (DSPDs),programmable logic devices (PLDs), field programmable gate arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In the case of an implementation by firmware or software, the embodimentof the present invention may be implemented in the form of a module,procedure or function for performing the aforementioned functions oroperations. Software code may be stored in the memory and driven by theprocessor. The memory may be located inside or outside the processor andmay exchange data with the processor through a variety of known means.

It is evident to those skilled in the art that the present invention maybe materialized in other specific forms without departing from theessential characteristics of the present invention. Accordingly, thedetailed description should not be construed as being limitative fromall aspects, but should be construed as being illustrative. The scope ofthe present invention should be determined by reasonable analysis of theattached claims, and all changes within the equivalent range of thepresent invention are included in the scope of the present invention.

INDUSTRIAL APPLICABILITY

The method of performing a BWP operation in a wireless communicationsystem according to the present invention has been described based on anexample in which it is applied to the 3GPP LTE/LTE-A system and the 5Gsystem (new RAT system), but may be applied to various wirelesscommunication systems in addition to the 3GPP LTE/LTE-A system and the5G system.

What is claimed is:
 1. A method of transmitting, by a user equipment, asignal in a time division duplex (TDD) wireless communication system,the method comprising: receiving, from a base station, configurationinformation comprising (i) information for a first bandwidth part (BWP)and (ii) information for downlink (DL) BWPs; receiving, from the basestation, a signal on the first BWP based on an initial access procedure;receiving, from the base station, downlink control information (DCI) onthe first BWP, where the DCI is related to switching a DL BWP to asecond BWP among the DL BWPs; based on the DCI related to switching theDL BWP, switching an uplink (UL) BWP to a third BWP that corresponds tothe second BWP; and transmitting, to the base station, a signal on thethird BWP.
 2. The method of claim 1, wherein switching the UL BWP to thethird BWP comprises activating a BWP or deactivating a BWP.
 3. Themethod of claim 1, wherein the information for the DL BWPs comprises BWPidentifiers (IDs) to identify the DL BWPs.
 4. The method of claim 1,wherein: the DCI related to switching the DL BWP is received in a sharedcontrol resource set (CORESET), and the shared CORESET is configured ina part that is commonly shared between a plurality of configured BWPs.5. The method of claim 4, wherein each of the plurality of configuredBWPs have an identical numerology.
 6. The method of claim 1, furthercomprising: transmitting, to the base station, an acknowledgement (ACK)or a negative acknowledgement (NACK) for the DCI.
 7. The method of claim1, wherein switching the UL BWP to the third BWP that corresponds to thesecond BWP comprises: switching the UL BWP to the third BWP having a BWPindex that is identical to a BWP index of the second BWP to which the DLBWP was switched.
 8. A processing apparatus configured to control a userequipment to transmit a signal in a time division duplex (TDD) wirelesscommunication system, the processing apparatus comprising: at least oneprocessor; and at least one computer memory operably connectable to theat least one processor and storing instructions that, based on beingexecuted by the at least one processor, perform operations comprising:receiving, from a base station, configuration information comprising (i)information for a first bandwidth part (BWP) and (ii) information fordownlink (DL) BWPs; receiving, from the base station, a signal on thefirst BWP based on an initial access procedure; receiving, from the basestation, downlink control information (DCI) on the first BWP, where theDCI is related to switching a DL BWP to a second BWP among the DL BWPs;based on the DCI related to switching the DL BWP, switching an uplink(UL) BWP to a third BWP that corresponds to the second BWP; andtransmitting, to the base station, a signal on the third BWP.
 9. Theprocessing apparatus of claim 8, wherein switching the UL BWP to thethird BWP comprises activating a BWP or deactivating a BWP.
 10. Theprocessing apparatus of claim 8, wherein the information for the DL BWPscomprises BWP identifiers (IDs) to identify the DL BWPs.
 11. Theprocessing apparatus of claim 8, wherein: the DCI related to switchingthe DL BWP is received in a shared control resource set (CORESET), andthe shared CORESET is configured in a part that is commonly sharedbetween a plurality of configured BWPs.
 12. The processing apparatus ofclaim 11, wherein each of the plurality of configured BWPs have anidentical numerology.
 13. The processing apparatus of claim 8, theoperations further comprise: transmitting, to the base station, anacknowledgement (ACK) or a negative acknowledgement (NACK) for the DCI.14. The processing apparatus of claim 8, wherein switching the UL BWP tothe third BWP that corresponds to the second BWP comprises: switchingthe UL BWP to the third BWP having a BWP index that is identical to aBWP index of the second BWP to which the DL BWP was switched.
 15. Anon-transitory computer readable storage medium storing at least oneinstruction, that, based on being executed by at least one processor,perform operations comprising: receiving, from a base station,configuration information comprising (i) information for a firstbandwidth part (BWP) and (ii) information for downlink (DL) BWPs;receiving, from the base station, a signal on the first BWP based on aninitial access procedure; receiving, from the base station, downlinkcontrol information (DCI) on the first BWP, where the DCI is related toswitching a DL BWP to a second BWP among the DL BWPs; based on the DCIrelated to switching the DL BWP, switching an uplink (UL) BWP to a thirdBWP that corresponds to the second BWP; and transmitting, to the basestation, a signal on the third BWP.